JPS60168075A - Vacuum vessel inner-wall maintaining device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for performing maintenance work on the inner wall of a vacuum vessel, such as a vacuum vessel of a nuclear fusion reactor.

[Prior art]

The inner wall of this Yuzu vacuum container is coated with titanium, and in conventional inner wall maintenance work, high voltage and large current are applied to titanium balls held in a predetermined position inside the vacuum container to melt and diffuse the coating. , the damaged part of the titanium coating was repaired. The titanium ball is attached to the tip of the shaft-like structure. In order to maintain the vacuum atmosphere inside the vacuum container, the outside of the shaft-shaped structure is surrounded by a tubular guide, and this official guide is connected to a predetermined part of the vacuum container to create an interior where the vacuum container and the tubular guide are connected. In a vacuum atmosphere, the shaft-like structure is vertically driven in a φ-lowered form inside the tubular guide by a drive mechanism installed at the top of the tubular guide, and when titanium coating is performed, the shaft-like structure is The titanium ball attached to the tip of the object was lowered to the above-mentioned predetermined position in the vacuum container, and after the titanium coating was completed, the shaft-like structure and the titanium ball were again stored in the tubular guide. A high-voltage cotton wire assembly is connected to the titanium ball to supply electricity to it, but the outside of the high-voltage conductor assembly is covered with an inorganic insulator to electrically insulate the high-voltage conductor assembly from the shaft-like structure. There is.

The conventional device is constructed as described above, and the titanium balls are placed in a vacuum container (one rectangular piece 73 It was not possible to selectively apply a localized titanium coating to only one part. Furthermore, it did not have a means for observing the state inside the vacuum container. Therefore, the amount of titanium balls that exceed the membership fee is consumed, the work time for coating is long, and it is necessary to replace the titanium balls many times. The disadvantage was that it was not possible to grasp the current situation.

[Summary of the invention]

This invention was made to eliminate the drawbacks of the conventional ones as described above, and in this invention, the axial direction of the tubular structure connected to the vacuum container is defined as
Assuming two orthogonal coordinate axes, it is possible to move up and down in the Z-axis direction and protrude in the direction perpendicular to the Z-axis.
An arm tip that can rotate in the X-Y plane with ll as the center was provided, and an office block that could move freely in the direction of its length was mounted on the arm tip. By attaching a titanium deposition source to the moving block,
The titanium evaporation source is
It is designed so that it can be melted and diffused at any coordinate position on the Z coordinate axis, and the situation inside the vacuum container can be observed using an image guide imaging unit attached to the tip of the arm.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is an explanatory diagram showing one embodiment of the present invention, in which (1) is a drive unit, )2) is a tubular structure, (3) is a gate valve, (4) is a vacuum container, and 151 is a Vacuum container (
This is a boat that forms part of 41. Gate valve (3
), the internal atmosphere of the vacuum container (41 and port (5) and the tubular structure (21) is ventilated or cut off. +61 is the arm main body, (7) is the arm rotation part, (8
1 is the tip of the arm, (8a) is the drive wire, (9) is the titanium evaporation source, (lO) is the high voltage lead wire assembly, old j is the high voltage lead wire support ring, 02 is the image guide imaging unit, (1
2a) is an image guide, (13i is a Makabe bomb unit), H is an operation panel, 4 is an optical connector, (IQ is a television camera, and 71 is a monitor receiver.

Next, Fig. 2 is an explanatory diagram showing the JA process (of the image guide (12a)).
is the subject. 3 is a detailed explanatory diagram of the vicinity of the arm tip (8) in FIG. 1, where the same reference numerals as in FIG. 1 indicate the same parts, (21) is the drive block,
is a cam follower, and (23) is a light guide.

The image guide (12a) is composed of, for example, tens of thousands of ultra-fine silica-based optical fibers arranged in an array, one end of which constitutes the image guide imaging section (12), and the end of each optical fiber in the image guide imaging section a. The incident light is transmitted by the image guide (12a), received by the television camera OQ via the optical connectors α, and displayed on the monitor television receiver (171).

In the drive Koriyama, the arm main body (61) is driven vertically within the tubular structure (2) and the boat (51), and the axis of the arm tip: 81 is aligned with two axes (not shown). The direction of the length is changed between the state of being in the X7Y plane perpendicular to the Z axis (the state shown in Figure 1), and the arm tip +81 f Z axis is moved through the arm rotation part (5). rotate around the drive wire (8a) to the cam follower (22)
The position of the titanium evaporation source (9) installed on the movable block (21) within the arm tip 81 is changed by winding it up through the movable block (21). A lower voltage conductor support ring Uυ is provided to allow the movable block (high voltage conductor assembly 10) to easily expand and contract without maintaining its insulation when the position of the movable block (2υ) changes.

The tubular structure (2) is connected to the boat (51), and the operation panel (1
Control the drive unit (1) from 4 to set the position of the movable block (21) at a predetermined position, and control the vacuum pump unit (13i) from the operation panel (4) to vacuum the vacuum container (4). After creating an atmosphere, a current is applied to the titanium evaporation source (9) to melt and diffuse it.The entire area inside the vacuum vessel (4) is monitored by the image guide imaging unit fixed to the end of the arm (8) in the casing. Like the image guide (12a), the light guide (23) uses an optical fiber to transmit light from the light hole and illuminate the inside of the vacuum container (41).

The situation inside the vacuum container (4) that entered the image kite imaging unit αa as the subject 1201 is shown in the image guide (12a).
When it reaches the image guide receiver U, it is converted to 'r[ki1g] by the television camera H and displayed as an image on the monitor receiver (17).

As described above, it is possible to locally repair titanium coating and observe the situation inside the vacuum vessel before and after the repair.

In addition, although the case where this invention is applied to a nuclear fusion reactor was described above, the apparatus of this invention can also be applied to a light water reactor, a fast breeder reactor, etc.

[Effects of the Invention] As described above, according to the present invention, the titanium evaporation source is configured so that it can be melted and diffused at any position within a predetermined range within a vacuum container, and the inside observation function is provided. This also makes it possible to increase the efficiency of maintenance work on the inner wall of the vacuum vessel and improve technical reliability.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an embodiment of the present invention, Fig. 2 is an explanatory diagram showing the principle of the image guide in Fig. 1, and Fig. 3 is an explanatory diagram showing details of the vicinity of the arm tip in Fig. 1. It is a diagram. Mountain... Drive unit, (2)... Tubular structure, (3)...
Gate valve, (41... Vacuum vessel, (51... Boat, (6)... Arm main body, +71... Arm rotation part, (81... Arm tip, (9)...・Titanium deposition source, ulJl...High voltage conductor assembly, Uυ・
...High-voltage conductor support ring, o...Image guide imaging section, (12a)...Image guide, (''Praise...
Vacuum pump unit, αυ... optical connector, (21)
...Movable Pro Nku. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Masuo Oiwa Figure 1 Figure 2

Claims (1)

[Scope of Claims] A tubular structure connected to a boat portion of a vacuum vessel, in which gas flow between the vacuum vessel and the vacuum vessel is blocked or opened by a gate valve; this tubular structure is connected to the vacuum vessel; A vacuum pump unit is used to create a vacuum in the interior of a vacuum container that is kept airtight with the outside air in a vacuum state. At this time, a rod-shaped arm main body part that can move up and down in two axial directions inside the tubular structure, and is extended from the lower end of this arm main body part, and the direction of extension can be changed with respect to the axial direction of the arm main body part. a rod-shaped arm tip configured as shown in FIG. a movable block that can be moved by the movable block; a titanium deposition source mounted on the movable block; a high-voltage conductor assembly disposed through the tubular structure to the titanium deposition source for supplying current to the titanium deposition source; A plurality of sections holding a plurality of sections along the arm tip of the high voltage conductor assembly and sliding over the arm tip as the movable block moves along the length of the arm tip. A high voltage conductor support ring, vertical movement of the arm main body in the Z-axis direction, changing the angle between the length direction of the arm tip and the length direction of the arm main body, and Rotational movement around two axes of the tip of the arm via the rotating part, and the opening.
a drive unit that drives the moving block along the length direction of the tip of the arm; an image guide imaging unit that is attached to the tip of the arm so that the light beam from the inner wall of the vacuum container is incident thereon; An image guide provided to transmit a light beam incident on the image guide imaging section to a predetermined location of the tubular structure, and light optically coupled to the image guide at the predetermined location of the tubular structure. Vacuum vessel inner wall maintenance device equipped with a connector.